Meghan Markle must follow this bedtime rule when she stays with the Queen

Since officially entering royal life following her May 19 wedding to Prince Harry, Meghan Markle has many rules she must follow.

According to Sir William Heseltine, one of Queen Elizabeth's private secretaries, claims that when staying with Her Majesty, members of the royal family must wait until the Queen retires to bed before they do.

He explained that it’s considered 'bad form' to go to bed before Her Majesty.

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In a rare interview for new book, The Royals In Australia, Sir William reveealed 'nobody felt it right to go to bed before the Queen did.'

And while the tradition is something Meghan Markle may have to adopt now she’s an official royal, according to Sir William, it was something Princess Diana struggled with.

He revealed, 'For Diana the long royal evenings were agony.

'There’d be an hour or so in the sitting room of everyone sitting around making conversation, and nobody felt it right to go to bed before the Queen did.

'And Diana was driven to such extremes that she’d excuse herself and go to bed, which was thought to be rather bad form, going to bed before the Queen.'